SOPRAVAP’R™ is an SBS-modified bitumen vapor barrier for use in approved multi-ply membrane and flashing assemblies. SOPRAVAP’R is composed of a proprietary formulation of elastomeric styrene-butadiene-styrene (SBS) polymer modified bitumen in combination with a high tack self-adhesive specifically designed for use with steel decks. The topside is surfaced with high strength tri-laminate polyethylene film and the underside is surfaced with protective polyolefin release film that is removed during application.

Product Properties

  • ASTM ASTM D2178, ASTM E96
  • Installation Method Self Adhered
  • Thickness 31.5 mils (0.8 mm)
  • Topside Polyethylene Film
  • Underside Release Film


Prior to installation, unroll SOPRAVAP’R onto the roof surface and allow to relax. SOPRAVAP’R may be applied to steel, plywood, gypsum, concrete, or asphalt panels. Place SOPRAVAP’R in desired position. Remove the protective release film from the underside of the sheet and roll SOPRAVAP’R into place with a weighted roller.

Testing & Approvals

FBC FL13806-R8  Liquid-Applied Roof Systems FM Miami-Dade UL

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